Namesakes
American Presidents:
1 president
Lyndon B. Johnson 1963-1969 
Notable Actors and Entertainers:
1 actor
Lyndon Brook 1926-2004
Notable Writers:
1 author
P. L. Travers (a.k.a. Lyndon) 1899-1996
Olympic Medalists:
1 gold, 1 silver/bronze
(silver/bronze) John Regis (a.k.a. Lyndon) 1988; 1992 4x100 m relay; 4x400 m relay
(gold) Lyndon Ferns 2004 swimming - 4x100 m freestyle relay